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Issue 19, 2018
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A tip–gap mesh-like bilayer SERS substrate for highly sensitive detection

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Abstract

Tips of noble metal nanostructures and the gaps between closely packed noble metal nanostructures are widely claimed as hot-spots for SERS sensing. A significant amount of effort and expertise has been devoted to the reformation and maximum utilization of the “tips” and “gaps”. However, most studies focus on the “tips” or the “gaps” separately. Here we report a novel SERS substrate that contains a particular mesh structure of curved-edge gold nanocubes (CENCs) and Au nanospheres (Au NSs), one of the tips of CENCs inserted into the gaps between three closely packed Au NSs. Meanwhile, a facile and time-saving novel protocol has been proposed to fabricate this mesh structure in the form of a bilayer SERS substrate. The as-fabricated substrate exhibited extraordinary SERS sensitivity for malachite green (MG) and melamine, which could be attributed to the tip–gap mesh structure. The detection limit is as low as 10−12 M and 10−9 M, respectively.

Graphical abstract: A tip–gap mesh-like bilayer SERS substrate for highly sensitive detection

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Publication details

The article was received on 12 Mar 2018, accepted on 05 Apr 2018 and first published on 05 Apr 2018


Article type: Paper
DOI: 10.1039/C8AY00530C
Citation: Anal. Methods, 2018,10, 2251-2256
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    A tip–gap mesh-like bilayer SERS substrate for highly sensitive detection

    L. Lv, J. Li, W. Fang, A. Shen and J. Hu, Anal. Methods, 2018, 10, 2251
    DOI: 10.1039/C8AY00530C

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